Running out of space on 13 gb iPhone 4?

I got my cousins old iPhone that was a 16 gb 4 but we got all his memory erased to give to me. It is now 13 gb, I need more space - I deleted all my apps that I don't use and pictures that don't matter. But I've downloaded so many apps then deleted them, what should I do?

If you want more Space Just Try These Steps-
1- Download Clean Master.
2- Run Clean master.
3- Clean all your Cache, Close all the apps and More Options are there.
4- After Cleaning you will get Valuable Space Or If you Have a Sd Card Just shift the downloaded Apps To Sd Card and you will have Ipod Space.

Apple is ***! This is the problem with iPhones once you run out of space there's no way to extend/ increase memory except deleting something… Not with android if you run out of space you can simply buy a bigger sd card and voila!

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